[
    new MagicWhenBlocksTrigger() {
        @Override
        public MagicEvent executeTrigger(final MagicGame game,final MagicPermanent permanent,final MagicPermanent blocker) {
            final MagicPermanent blocked = permanent.getBlockedCreature();
            return (permanent == blocker && blocked.isValid()) ?
                new MagicEvent(
                    permanent,
                    blocked,
                    this,
                    "Return RN to its owner's hand at end of combat."
                ):
                MagicEvent.NONE;
        }
        @Override
        public void executeEvent(
                final MagicGame game,
                final MagicEvent event) {
            final MagicPermanent creature = event.getRefPermanent();
            game.doAction(new MagicChangeStateAction(creature,MagicPermanentState.ReturnToHandOfOwnerAtEndOfCombat,true));
        }
    }
]